#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
struct ListNode {
    int val;
    struct ListNode* next;
   
};

bool hasCycle(struct ListNode* head) {

    if (head == NULL)
        return false;
    struct ListNode* slow, * fast;
    slow = fast = head;
    while (fast)
    {
        slow = slow->next;
        if (fast->next)
            fast = fast->next->next;
        else
            return false;
        if (slow = fast)
        {
            return true;
        }
    }
    return false;
}

int main()
{
    struct ListNode* n1 = (struct ListNode*)malloc(sizeof(struct ListNode));
    struct ListNode* n2 = (struct ListNode*)malloc(sizeof(struct ListNode));
    struct ListNode* n3 = (struct ListNode*)malloc(sizeof(struct ListNode));
    struct ListNode* n4 = (struct ListNode*)malloc(sizeof(struct ListNode));
    struct ListNode* n5 = (struct ListNode*)malloc(sizeof(struct ListNode));
    n1->val = 3;
    n2->val = 2;
    n3->val = 0;
    n4->val = 1;
    n5->val = 4;
    n1->next = n2;
    n2->next = n3;
    n3->next = n4;
    n4->next = n5;
    n5->next = n2;
    
    hasCycle(n1);


    return 0;
}